Processor Tech General Purpose Module

For my own reference, I took some pictures of Bill Sudbrink's Processor Tech General Purpose Module card, which is similar to mine except that he made some modifications to protect some of the F000+ memory when CUTER and NorthStar DOS try to use the same spaces. Here are the pictures I took:
Processor Tech General Purpose Module Mods for NS DOS and CUTER

Of course now I have a problem with my CUTER program, I must have blown an IC. Next - find and repair the bad component.

While at the Vintage Computer Festival I was given a NS* disk with CP/M BIOS edited to work with CUTER. My GPM is wired quite wildly, but it works (until I screwed something up), and I could get a prompt and load programs by entering machine language through CUTER.

I am no longer able to boot a known-working Northstar CP/M disk in a known working drive with a known working MDC-A4 driver card. If I remove the GPM card and jump to the loader address I can hear the disk loading, but I have to rely on the GPM for screen and keyboard I/O.

I took pictures of a another working GPM card so I could compare the two. I noticed that I did not have the same jumper connecting aa to L.

I should have been more thorough, but I decided to jumper my GPM card's aa and L. When I tested this configuration it must have caused a fault because now the previously working Processor Tech GPM card, with CUTER in U9, does not display the prompt.

When I boot CUTER the program (attempts to) loads, but the prompt freezes at the solid block stage when CUTTER is initializing, before the > prompt.

The closest IC to the U9 jumpering disaster is the the SN74LS367N in the U18 socket. I hypothesize that this IC could be bad as a result of my jumpering (or one of the components near by).

I have to figure out what I may have fried.

BUT FIRST, let's see if the CUTER program is loaded into memory. The first byte is located in C000 and is a 7F = START